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- In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes. It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca.
- Among insects, the rostrum is the name for the piercing mouthparts of the order Hemiptera. The long snout of weevils may also be called a rostrum.
- The beak or snout of a vertebrate may be referred to as the rostrum, especially dolphins or sawfish.
- Charles Drew (November 17, 2003). "Crustacea". University of Bristol. Retrieved November 7, 2010.
- Todd A. Haney, Joel W. Martin & Eric W. Vetter (2007). "Leptostraca". In James T. Carlton. The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon (4th ed.). University of California Press. pp. 484–495. ISBN 978-0-520-23939-5.
- George Gordh, Gordon Gordh & David Headrick (2003). "Rostrum". A Dictionary of Entomology. CAB International. p. 792. ISBN 978-0-85199-655-4.
- Douglas Grant Smith (2001). "Mollusca (gastropods, pelecypods)". Pennak's freshwater invertebrates of the United States: Porifera to Crustacea (4th ed.). John Wiley and Sons. pp. 327–400. ISBN 978-0-471-35837-4.
- Burt Carter. "Cephalopods". Invertebrate Paleobiology.
- "Basic anatomy of Cetaceans - Dolphins". Robin's Island. Retrieved November 7, 2010.
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